Delete row sig_6a84850533f9 from signals

id sig_6a84850533f9
event_id evt_28b29d81144b
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_ab04618ac ...
dedupe_key signal_enriched:news_delta:3ef646648c2f0033
throttle_s 0
created_at 2026-04-14T14:10:44.558498+00:00
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